How to Find Third-Party Sellers on Your ASINs as a Vendor

A retail partner forwards a screenshot of your product listed below your minimum advertised price, or an ASIN that's sold steadily for months starts converting worse, and the first thing you need to know is who else is selling it. You need a seller name before you can call a distributor, send a notice, or file a report with Amazon, and Vendor Central won't give you one. The console has no screen that lists the third-party sellers on your ASINs, so the whole routine below happens on the public Amazon.com listing and in Brand Registry.

This guide walks through finding the sellers on an ASIN, reading what their storefronts tell you, deciding whether each one is authorized, recording the evidence, and filing the report. If you want background on minimum advertised pricing itself, the MAP compliance guide covers what the policy is and how Amazon's program works.

Read the Live Listing's Offer Display

Start on the ASIN's detail page on Amazon.com. The lines under the Buy Box name the seller of the offer a shopper would buy right now, and the Other Sellers section lists the rest of the sellers offering the product.

1. Open the ASIN's detail page on Amazon.com in a desktop browser. The mobile app words the seller lines differently, so sticking to desktop keeps your records consistent from one check to the next.
2. Find the "Ships from" and "Sold by" lines below the Buy Box. When both name Amazon.com, you're looking at Amazon's retail offer, and a company name on either line means a third-party seller's offer is involved.
3. Find the "Other Sellers" section on the right side of the page. It lists the other sellers offering the ASIN, and each store name in it links to that seller's storefront.
4. Work down that list and write down every seller name other than Amazon.com, along with the price on each offer.

Be careful with the brand name printed on the listing, the "by Acme" line under the product title. It says whose product it is, but it tells you nothing about who's selling this particular offer, so always take the seller's identity from the "Sold by" line or the Other Sellers list.

Open the Seller's Storefront and Read What It Tells You

Each seller name in the "Sold by" line and the Other Sellers list links to that seller's storefront page on Amazon, and the storefront is where you pin down exactly which account you're dealing with.

1. Click the seller's name in the "Sold by" line or in the Other Sellers list.
2. Copy the storefront URL from your browser's address bar. The seller's ID is the string of letters and numbers after seller= or merchant= in that URL.
3. Record the ID next to the seller's display name. Names can look alike across accounts, and the ID is the precise way to refer to one seller in your notes and in any report you file.
4. Look through the storefront. It shows the seller's other listings and their feedback, which gives you a sense of whether the account carries many brands or concentrates on yours. The page also carries a "Report abuse" link.

The storefront tells you who the seller is, and whether they belong on your listing is something you settle from your own distributor records in the next step.

Authorized Reseller or Violation? Decide Before You Escalate

An unauthorized seller can be selling your genuine product through a channel you never approved. That's a distribution problem and a separate case from counterfeiting, and Amazon handles the two through different report types, so filing a genuine-goods reseller as a counterfeiter, or the reverse, slows the resolution of both.

Sort each seller you found before you do anything else:

1. Check the seller's name and ID against your own list of authorized distributors and resellers. That list is your reference for this check, so if it doesn't carry seller names and storefront IDs today, add them for every partner you confirm.
2. If the seller is on your list, you're dealing with a partner, and the conversation about their price or conduct goes through your agreement with them.
3. If the seller isn't on your list and the product appears genuine, treat them as an unauthorized reseller.
4. If you have reason to suspect the product itself is counterfeit, plan a test purchase before you report anything.

What to Record Before You Report

Build the evidence file as soon as you find the seller, because offers come and go and one you didn't capture is hard to prove later. For each seller, keep:

• The ASIN and the listing URL
• A screenshot of the full listing, with the "Sold by" line visible
• The seller's display name, storefront URL, and seller ID
• The date you first saw the offer, and each date you checked it again
• Any messages you've already exchanged with the seller
• For a suspected counterfeit, the test purchase order and the item as it arrived, with the shipping label kept

Keep all of it in one dated log per ASIN, so when the same seller turns up on a second product you can see the pattern right away.

Reporting a Violation as a Vendor

Amazon's Report a Violation tool lives in Brand Registry at brandregistry.amazon.com/brand/report-a-violation, and using it requires Brand Registry enrollment. It covers copyright, trademark, counterfeit, and store policy violations. A rights owner who isn't enrolled in Brand Registry uses the Report Infringement form in Seller Central instead.

For a Vendor Central account, the enrollment detail that matters is which email you used. Brand Registry signs you in with the same credentials you use for Seller Central or Vendor Central, and the brand registration links to your selling account through the admin email on that account. A registration submitted under a different email may not connect correctly to your Vendor Central account and products, so if someone else on your team handled the enrollment, check which email they used before the day you need to file.

When you file, pick the violation type that matches the call you made in the authorization step, and pull the seller details and screenshots straight from your evidence file.

If You Came From Seller Central

Everything up to the report works the way you're used to. The Other Sellers list, the storefront, and the seller ID all live on the public Amazon.com listing, and neither console changes what you see there. Brand Registry signs in with the same credentials you use for Seller Central or Vendor Central, and if you never enrolled, the Report Infringement form is already inside Seller Central. The detail to carry over is the admin email, which should be the one on your Vendor Central account when you enroll the brand. For the rest of the move between consoles, the guide to where your Seller Central reports went maps what each report became.

What Vendor Central Will Not Give You

Vendor Central has no third-party offer report. There's no seller-identity view and no per-ASIN list of who's offering your product right now, so every step in this guide happens on the public listing or in Brand Registry. Across a catalog, that means a manual pass through each ASIN's detail page, repeated as often as the sellers change.

InsightLeap's 3rd Party Offers monitoring does that pass continuously and shows which third parties are selling each of your products, and its MAP & Price Violations monitoring tracks pricing violations across the same catalog, so you start from a current list of sellers instead of rebuilding it by hand.

If your real question is whether a third-party offer has taken the Buy Box from Amazon's retail offer, that's a separate check. The glossary entry for lost buy box due to price covers the Vendor Central rate that measures it, and the guide to lost buy box alerts covers what to do once it happens.

Start with the Other Sellers list on your highest-volume ASINs, record the seller ID for every name you don't recognize, and check each one against your distributor list before anything goes to Amazon.